Grow Light Embodying Power Delivery and Data Communications Features

ABSTRACT

Embodiments of the invention relate to fixtures, systems and methods for providing vegetation grow light fixtures with auxiliary power and/or data communication ports or hubs allowing for expansion of their functionality, modularity and adaptability. The addition of power or communication ports integrated with a grow light fixture enables other components to be connected directly to and powered by the grow light fixture. Such components may include but are not limited to supplemental lighting, sensors and actuators.

RELATED APPLICATIONS

This application claims priority to and the benefit of U.S. ProvisionalApplication No. 62/162,882, filed May 18, 2015, U.S. ProvisionalApplication No. 62/175,724, filed Jun. 15, 2015, and U.S. ProvisionalApplication No. 62/323,004, filed Apr. 15, 2016. The contents of each ofthose applications are incorporated herein in their entirety.

FIELD OF THE INVENTION

Embodiments of the invention relate generally to LED lighting fixturesthat incorporate supplemental external power ports and electricalcommunication capabilities for providing power to ancillary devices andfor receiving and transmitting data or control signals.

BACKGROUND OF THE INVENTION

Indoor agricultural and horticultural operations where plants are grownunder artificial lighting are increasingly commonplace. Some advantagesof indoor plant growth operations include allowing for extended growingcycles, increased yield per unit area (e.g., vertical framing), finetuning of environmental variables including light output to enhanceplant yield, security and enhance ability to monitor the operation.Various types of grow lights are available including incandescent,fluorescent, compact fluorescent, metal halide, high pressure sodium,and light emitting diodes (LEDS) based lighting. Each type presentsunique characteristics, such as, cost to purchase, cost to operate,efficiency, light spectrum and radiant power output, etc. Key featuresof plant grow lights include providing the appropriate amount ofphotosynthetically active radiation (PAR) to ensure and optimize plantgrowth. Providing the appropriate radiant spectrum and power whileminimizing energy consumption is another important goal of indoorgrowing operations and a benchmark metric of plant growth fixtures.

Light emitting diodes (LED) technology is rapidly being applied to theagricultural and horticultural fields to allow for high efficiencyindoor plant cultivation and growth. The increased energy efficiency ofLED technology compared with other lighting solutions coupled with thereduction of costs of LED themselves are increasing the number of LEDapplications and rates of adoptions across industries. Examples of suchindustries and markets include plant growing applications spanning thebreadth from small indoor home greenhouses and nurseries to full scaleindoor farming facilities. LEDs and associated technologies are becomingincreasingly electrically efficient and are supplanting other lightingtechnologies because of this efficiency and associated cost savings. LEDtechnology also promises greater reliability overall lifetimes thanother lighting technologies. Importantly, LED technology and solid statelighting (SSL) in general provides a platform to customize specificlight output spectra to meet the demands of any specific applicationthereby increasing efficiency and optimizing the light output to meetthe desired application. This feature of tailoring and tuning outputspectra of LED fixtures can be used in the grow lighting and otherarenas to provide the specific wavelengths and wavelength rangestailored and optimized to the specific application. For example, LEDlights with specific wavelengths in the far red and ultraviolet bandsare of interest to some growers for use during certain stages of plantgrowth to elicit a variety of positive plant growth and qualityresponses. Generally, optimization of photo-synthetically active regionsof the light spectrum depending on the plant species and/or growth cyclecan both reduce energy consumption and enhance plant growth and yield.

In many cases indoor plant grow operations may allow for a greatercontrol over the ambient environment and radiant flux than an outdoorgrow operation. For example, supplemental lighting may be added orremoved at will. Supplemental lighting may be provided to optimize thephoton flux on plant targets during specific times of the growth cycle.Adding supplemental lighting, e.g., additional grow light fixtures,generally requires running a new separate power cable and is cumbersomeand time-consuming and can add expense,

A wide variety of environmental and plant related sensors can beutilized to measure environmental and plant parameters. Measured dataand sensor output may be utilized to adjust the environment variablesincluding for example humidity and temperature. However, sensorsgenerally require power and require communication capabilities.Installing new power outlets and communication lines for each sensor iscostly and inconvenient. The used of supplemental lighting and sensorsfor environmental sensing and control can allow for customized growoperations and provide for enhanced plant yields, but theimplementation, customization, and need to modify and change thelocation of these components over time in a grow facility can be timeconsuming and challenging.

Adding supplemental lighting and/or environmental sensors requires botha source of power for the lighting and sensors and communicationchannels for obtaining and processing sensor data and for lighting andenvironmental control. Having the ability to move lighting and sensorsfreely to adjust the layout of the grow operation as needed can provideenhanced customization and tailorability of a grow operation. However,adding a supplemental lighting at a particular place in the growfacility, for a particular time period, or adding a new sensor and/orfeedback control system at a particular point in a grow facilityrequires the challenges of sourcing power and communication ports forthe new lighting or sensors, and generally requires running new powerand/or communication lines and setting up new support infrastructure,each of which can be costly, labor and time intensive, and which doesnot lend itself to easy modification.

BRIEF SUMMARY OF EMBODIMENTS OF THE INVENTION

Embodiments of the invention relate to fixtures, systems and methods forproviding vegetation grow light fixtures with auxiliary power and/orcommunication ports or hubs and for expansion of their functionality,modularity and adaptability. The addition of power or communicationports integrated with a grow light fixture enables other components tobe connected directly to and powered by the grow light fixture. Suchcomponents may include but are not limited to supplemental lighting,environmental or plant sensors, actuators, control systems, computers,etc. Example embodiments include grow light fixtures that incorporateone or more USB (universal serial bus) ports. USB ports are nowcommonplace and a well known component in many electronic devices. Theports function as bidirectional data and power supply points, and cansupply power up to and potentially exceeding 100 W. Other exampleembodiments include grow light fixtures with incorporatedPower-over-Ethernet (PoE) hubs. PoE hubs can supply power up to and inexcess of 200 W. USB ports or PoE hubs or both are incorporated intogrow light fixtures in order to provide a power source for auxiliarydevices (e.g., supplemental lighting and sensors) and a communicationschannel (e.g., for lighting and other devices, control, and sensorfeedback). These power and communication ports, onboard each fixture,eliminate the need for separate power sources or the need to runseparate wiring in the grow facility for powering and communications.Supplemental lighting and sensors may be connected directly to anexisting grow light fixture. Incorporating these power deliverycomponents within a grow light avoids the time consuming and cumbersometasks of removing certain grow lights to provide room for other growlights or extending power cords from a power supply outlet to a newlyadded grow light. A grow light fixture with provisions for supplyingpower to other grow light fixtures adds considerable overall deliveredlight and spectral flexibility to a plant growing operation at minimalcost.

Some embodiments of the invention include a lighting fixture with anintegrated supplemental power source comprising an LED light engine, apower supply for powering the LED light engine, an auxiliary powersource operative to provide output power from the lighting fixture, andan input means for receiving power from an external power source toprovide power to said power supply and to said auxiliary power source.Embodiments of the invention include an LED grow light fixture withintegrated supplemental power, wireless and sensor capabilitiescomprising an LED light engine operative to produce light tailored forplant growth, including a power a power supply for powering said LEDlight engine, a USB port or Ethernet Hub operative to provide outputpower from the lighting fixture and provide for data communications, ameans for wireless communications, and a sensor for measuring at leastone aspect of the environment or lighting fixture output and wherein thesensor is powered by said USB port or Ethernet hub.

Some embodiments include a supplemental lighting module for providingsupplemental lighting wherein the supplemental lighting module ispowered by an auxiliary power source from a main lighting fixture andnot powered directly by said power supply.

Some embodiment include a lighting fixture comprising an antenna forwireless communication. In some embodiments the lighting fixtureincludes an integrated Bluetooth communications module. In someembodiments wireless communications are used for sensing and/oractuation.

In some embodiments, the lighting fixture includes an auxiliary powersource that can also send and receive data signals. Embodiments includesignaling, controlling and/or powering one or more switches oractuators. In some embodiments the switches or actuators control atleast one of: lighting, ventilation or air temperature, humidity, soilirrigation, fixture orientation or configuration, video cameras,warnings, or data logging.

In some embodiments the main lighting fixture is designed to be poweredand operate on digital power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing an LED lighting fixture withintegrated external power ports, a Bluetooth radio module, and multiplesensors according to some embodiments.

FIGS. 2a-c show an LED lighting fixture with integrated external powerports, and a supplemental light bar powered by the external portaccording to some embodiments.

FIGS. 3a-b show an LED lighting fixture with integrated external powerand communication ports, and supplemental light modules which areconnected to and powered by the external ports according to someembodiments.

FIG. 4 illustrates an LED grow light fixture with integrated externalpower and communication ports and attached sensors according to someembodiments.

FIG. 5 illustrates an application of an LED grow light fixture with anintegrated low energy radio communications module according to oneembodiment.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Although the following detailed description contains many specifics forthe purposes of illustration, anyone of ordinary skill in the art willappreciate that many variations and alterations to the following detailsare within the scope of the invention. Accordingly, the followingpreferred embodiments of the invention are set forth without any loss ofgenerality to, and without imposing limitations upon, the claimedinvention.

According to one embodiment of the invention a grow light fixturecomprises one or both of a USB port and a power-over-Ethernet hub toenable either ancillary power, data communications or both. Power can besupplied through the USB port or the Ethernet hub to provide power toancillary devices including but not limited to additional lightingincluding grow lights, sensors, cameras or other electronic devices.Data communications capability provided by the USB port or Ethernet huballows for plug and play sensor connections, sensor readout andtransmission, and control of peripheral units such as supplementallighting, switches and actuators.

With power available at the light fixture the LED light fixture becomesa hub on which additional components can be connected and powered. Forexample supplemental grow lights may be added onto or in proximity tothe LED fixture and powered by the LED fixture (via the integrated USBport or Ethernet hub). Supplemental grow lights can be easily added,removed and replaced during any stage of the plant growth cycle withoutthe need of a separate or dedicated power source, This allows forauxiliary lights with different spectra to be easily added to the growoperation when needed by connecting to a existing light fixture that hasan external power port. Supplementing the standard grow light spectrumwith light from accessory LED bars, lamps, or other luminaires duringthe grow cycle provides many advantages including optimizing spectralirradiance on plants during the growth cycle and allowing spectralcustomization while using a standard LED grow fixture with a staticspectrum. This ability to customize the spectral output by selectivelyadding supplemental lighting eliminates the need to add specialwavelength LEDs to the standard grow light spectrum used on the basicgrow light product.

Data communications available at the LED light fixture via a USB port oran Ethernet hub integrated into the fixture also provides the capabilityto attach or connect auxiliary sensors and actuators which is useful forcontinuous assessment and control of the grow environment. The healthand development of the plants may be monitored throughout the growthcycle and manual or automated adjustments of various plant andenvironmental parameters may be made based on sensor feedback providingfor tailoring of input parameters, and for greater efficiency and plantyield. For example, sensor feedback and actuator control enables theability to measure and tune the radiation spectrum incident on theplants (e.g., through activation of supplemental grow lights), and alsoallows for the control and operation of automated systems, such astemperature, humidity control and water and nutrient delivery systems.The grow light fixture can thereby become a sensor hub for monitoringvarious aspects of the plant growth operation and a control hub foradjusting environmental and other variables in support of automation.

Some exemplary sensors that can be used according to the teachings ofembodiments of the invention include but are not limited to: an infraredthermopile sensor to remotely measure the plant temperature, an air flowsensor, air temperature and humidity sensors, CO2 and other atmosphericgas sensors, light quantity and spectral measurement (spectrometer)sensors, pH and electrical conductivity sensors, proximity sensors, anda soil moisture sensor. Certain sensors can be connected directly to theUSB port or Ethernet hub and the data carried over the communicationsbackbone. Other sensors, such as a soil sensor disposed at the plantlevel may communicate with the hub wirelessly (e.g., to avoid the tangleof wires from the sensor to the hub). In some embodiments a wirelesscommunication module is integrated in the LED lighting fixture. In oneembodiment, a Bluetooth Low Energy communications protocol is used and aBluetooth Low Energy host is incorporated into the LED fixture.

In some embodiments an Ethernet-based network may be used for videosurveillance. In some embodiments, an Ethernet network provides acommunications backbone for sensor data and control signaling. Amonitoring and control station may use this communication backbone tosend raw commands to actuators located at the growth site and connectedthrough the light fixture, or to send configuration settings to acontroller integrated in the fixture. Higher level network access fromthe lighting fixture may be available through a WiFi or a power linecarrier communications system.

FIG. 1 shows a schematic diagram of an LED lighting fixture according toone embodiment. The LED fixture 10 comprises integrated light modules20, each comprising one or more LEDs 26, for providing light output; apower supply 31 for powering and driving the light modules 20; aplurality of USB ports 12 and an Ethernet hub 14 for providing ancillarypower and data communications capability; and a Bluetooth Low Energyradio module and antenna 16 for providing wireless communications. Thefixture 10 also comprises means for receiving electrical power such asan AC power cord (not shown). The fixture 10 further comprises auxiliaryLED grow lights 22, each comprising one or more LEDs 28, the auxiliaryLED lights 22 being secured onto a frame 24. The integrated LED growlights 20 are an integral part of the fixture, powered throughconductors 30 from power supply 31. In one embodiment the USB port 12supplies power to an auxiliary grow light 22 over conductors 32, and theEthernet hub 14 supplies power (Power over Ethernet (PoE)) to anauxiliary grow light 22 over a conductor 34. It should be understoodthat the inclusion of both a USB port and Ethernet Hub is not arequirement of embodiments of the invention. Other embodiments includeone or more USB ports or Ethernet hubs but not both. Also, embodimentsof the invention do not require supplemental lighting modules. Theinclusion of a Bluetooth wireless communications module is also anoptional feature. Other forms or methods of personal area network (PAN)or non-meshed communications may be used. Additionally, other wireless(e.g., Wi-Fi, LAN, WLAN, IR) and wireline data communication schemes maybe used to send and receive data may be included in the LED lightfixture as will be evident to those skilled in the art.

According to one embodiment, one or more optional sensors 40 mounted onthe frame 24 sense data regarding environmental conditions proximate tothe plants (not shown) and communicate this data to the USB port 12and/or the Ethernet hub 14 over data lines not depicted in FIG. 1.Additional sensors remote from the fixture 10 (such as a soil moisture,not shown) may provide sensor data, communicated wirelessly, that arereceived by the Bluetooth radio module 16. Although the sensors 40 aredepicted as mounted on an end plate of the fixture 10, in otherembodiments the sensors can be mounted in other advantageous locations.For example, the sensors can be integral with a fixture support bracket,or in other embodiments the sensors may be disposed at other locationson the fixture, proximal to the fixture, or even distal to the fixture.In some embodiments, the sensors are tethered to the fixture orotherwise remote from the fixture. The data network and power deliverycapabilities integrated into the fixture simplify the connection ofsensors for monitoring, for instance, water temperature, salinity, andwater flow, and also may power other devices.

In one embodiment, the integrated grow lights 20, the integral USB port12, the Ethernet hub 14, and/or the Bluetooth Low Energy radio 16 arepowered by a DC power supply 31, for example and switched mode powersupply. In some embodiments, the integrated light module 20, USB ports12 or Ethernet Hubs 14 and radio 16 are powered by the same powersupply. In other embodiments, individual modules or components mayreceive power from different sources, for example, multiple powersupplies, AC power, or a reserve power source such as a battery.

In one embodiment, the USB hub 12, the Ethernet hub 14, and/or theBluetooth radio module 16 are connected to a data network that is linkedto a data monitoring and controlling station over data conductors 36.For example, data collected by the soil moisture sensor (not shown) iscommunicated from the sensor to the Bluetooth radio module 16 on thefixture 10 and from the radio module to the data monitoring andcontrolling station over the conductors 36. Based on the sensed soilmoisture the monitoring and control station can energize a pump or anactuated valve (not shown) for supplying water to soil-based plants. Inother embodiments, temperature and other sensors are connected to thefixture via the USB port. The connection provides power to the sensorand a communication channel that allows sensor data to be received ortransmitted via the fixture. In one embodiment the fixture is connected(via wireline or wireless connection) to a network of devices ordirectly to one or more devices including but not limited to fans,heating and air conditioning systems, humidifiers or dehumidifiers,window openers or window shades, lighting control system, sprinklers andirrigation systems or other actuation controls. Connecting and poweringsensors from individual fixtures and using the sensor data to controldevices within the grow environment allows convenience, flexibility andadaptability, and means in general to finely monitor and control theplant grow operation. For example a temperature sensor data can be usedto in conjunction with ventilation, heating and air conditioning andother systems to monitor and adjust environmental parameters such as airand plant temperature and identify, create or eliminate microclimateswithin a grow facility. Actuators may be programmed to respondautomatically to various sensor data. Alternatively, a wide variety ofreal time sensor data may be monitored or accessed by a system operatorwho may adjust environment parameters directly (e.g., manually).

According to some embodiments, when a sensor is connected to a fixture,for example via plugging it into a USB port on the fixture or by pairingthe sensor with the fixture via Bluetooth or other PAN communicationsmethods, the location of that sensor, e.g., on or near the specificfixture, is automatically known. Knowing where a specific sensor islocated, e.g., within a grow facility, provides for increased resolutionof sensing activities by allowing the sensor data from each uniquesensor to be associated with a specific location within the growfacility. For example, if one or more specific temperature sensorsindicate an aberration in temperature, the location of that temperaturevariation can be identified and climate control (e.g., via fans or HVACsystem) targeting that specific location can be effected. In theseembodiments, the location and relative position and configuration ofeach fixture within the grow facility is known. In some embodiments,each fixture has a unique identifier associated with it to indentify itamongst other fixtures and the location of each fixture is entered intoa database or other data store. When a sensor is connected or otherwisepaired with a specific fixture, the addition of that sensor can becommunicated (e.g., via the network infrastructure) to the data storethereby assigning both a specific fixture and grow facility location tothat sensor. In some embodiments near field communication (NFC) can beused to pair a sensor with a fixture or other device. In someembodiments a computer, tablet, or smartphone may be used as anintermediary in pairing the sensor and fixture by means of a softwareapplication and communications facility resident on the tablet or othercomputerized device. The ability to automatically associate a locationof each sensor when it is connected or paired with a lighting fixtureprovides for flexibility and customization in sensing and environmentalmonitoring and for fine tuning environmental control and other growfacility devices.

FIG. 2a shows an LED light fixture with integrated external power portsaccording to one embodiment of the invention. LED lighting fixture 50includes structural frame 55, one or more integrated lighting modules 52for providing illumination and one or more integrated USB ports 54 (oralternatively an Ethernet hub) for providing a source of external power,and in some embodiments the USB ports 54 are enabled and utilized fordata communications. The LED lighting modules 52 comprise one or moreLEDs (not shown). The LED lighting modules are powered by an internalpower supply which is connected to main power via a main power cordaccording to this embodiment (neither power supply or power cord areshown). The USB port (or Ethernet Hub) may be powered by the main powerline, an internal power supply or other means. Optional wirelesscommunication capability such as a Bluetooth transceiver (not shown) mayalso be incorporated into the device. The LED lighting fixture 50 alsoincludes a means for hanging or securing a supplemental lighting unit.In this embodiment, the securing means is a slot or slotted flange 56incorporated into the main fixture 50, but many other securingarrangements are possible. FIG. 2b shows a supplemental lighting fixtureor light bar 57 according to some embodiments. The light bar 57comprises an LED light engine (not shown) and a USB or Ethernet powerinput port 58 for receiving power. The light bar 57 also includes meansfor attaching it to the LED lighting fixture 50 so that the light bar 57may be hung or otherwise supported or attached to the main light fixture50. In this embodiment, the means of attachment include a protruding tab59 designed to fit into slotted flange 56 of LED fixture 50. The lightbar 57 and LED light engine are powered by power received via the USBport (or Ethernet hub) and do not require other sources of externalpower. The supplemental LED light bar may be designed to output a fixedlight spectrum or a tunable spectrum. In embodiments where the light barcan produce a tunable spectrum, the power to and control (e.g., via datasignaling) of the light bar output may be controlled via the USB (orEthernet) connections.

Embodiments of the invention wherein supplemental light bars may beadded to the main fixture provides for an increase in flexibility of themain lighting fixture and grow operation. The ability to modify thespectrum and/or intensity of photosynthetically active radiation (PAR)directed and delivered to plant targets allows for flexibility andcustomization in plant growth operations. Examples include but are notlimited to adding ultraviolet light to increase yield near end of agrowth cycle, or increasing infrared radiation to trigger the onset offlowering. Generally, supplemental lighting bars also provide the meansto customize light spectrum and intensity to produce photo-morphologicaleffects in plants. FIG. 2c shows the embodiment wherein the light bar 57is attached to and powered by the main fixture 50, and includes an LEDlight fixture 50, including integrated lighting modules 52, integratedUSB ports or Ethernet hub 54, and attached supplemental LED light bar 57attached via attachment means 59. In this example the attachment meansis a tab 59 of the light bar 57 securing into a slot 56 of the mainfixture 50. A conductive cable 53 (e.g., a USB cable or Ethernet cabledepending on the application) extends from the main fixture's USB (orEthernet) power port and inputs into the input port 58 of the LED lightbar. In operation, the LED light bar 57 is powered by the USB orEthernet port incorporated into the main LED fixture 50. Multiple lightbars or other supplemental light modules may be attached and powered bythe power ports of the main fixture 50 according to differentembodiments. The specific locations of the USB ports shown are examplesonly and the USB ports, as will be evident to those skilled in the art,could be incorporated in one or more of a variety of locations on themain LED light fixture and/or supplemental LED light bar. Power andcommunications could alternatively be provided via an Ethernet hub onthe main fixture and an Ethernet connector on the light bar. In thisembodiment, an Ethernet cable would be used to connect the main fixtureto the supplemental light bar. It is to be understood that the locationof USB ports or Ethernet hubs, the particular design and configurationof an LED light fixture and light bars and their relative arrangementsand means of connecting, as shown in these embodiment, are but exampleembodiments and many other designs, configurations and arrangements arepossible. For instance, the USB ports or Ethernet hub may be located onthe top side or the bottom side or anywhere else on the fixtures that isdesired and appropriate for the particular luminaire design.

FIGS. 3a and 3b show examples of supplemental lighting fixtures beingpowered by a cable connection to a primary lighting fixture according tosome embodiments. As shown in FIG. 3a , primary LED lighting fixture 60,comprising one or more integrated LED light modules 61 and is suspended,for example from the ceiling in a grow facility over one or more plants(not shown), and is powered by a main power cable, for example AC power(not shown). The primary fixture 60 comprises an external port forproviding external power (e.g., a USB port or Ethernet hub) 62 and mayoptionally include means of wireless communications, sensors, and othercomponents (not shown). Supplemental lighting fixture 64 is suspended inproximity to the primary fixture 60, and includes a power input port 65to receive power. A conductive cable (USB or Ethernet) 63, withappropriate connectors, delivers power, and optionally datacommunications, from the external power output port 62 on the primaryfixture 60 to the supplemental fixture 64 via its power input port 65.FIG. 3b shows an embodiment wherein supplemental lighting fixtures 68are suspended from or otherwise attached to the primary fixture 60. Thesupplemental light fixtures 68 are attached via hangers 69 to theprimary fixture. The hangers 69 may be stand alone units designed toconnect to both primary and supplemental fixtures or alternatively theymay be integrated into one or each of the fixtures. Power is supplied tothe supplemental fixtures 68 via conductive cables 63 that carry powerfrom the external power port 62 on the primary fixture to the inputpower port 65 on the supplemental fixture. Many variations of usingsupplemental lighting units, whether stand alone or attached to theprimary fixture, that are powered by one or more external power ports onthe primary fixture are contemplated and the embodiments of theinvention are not limited to any particular arrangement.

FIG. 4 shows an LED grow light fixture 70 with integrated external powerports 73 for providing power to and communications with one or moresensors, transducers or other measuring or data generating devicesaccording to some embodiments. The LED grow light fixture 70 comprisesone or more integrated lighting modules 71, each lighting modulescomprising one or more LED boards 72 containing LEDs. The fixture 70includes one or more power supplies (not shown) for powering thelighting modules 71 and a main power input cable (not shown). Thefixture 70 also comprises a power and communications ports (e.g., USBport or Ethernet hub) 73, and one or more sensors or transducers 75, 76,and 77 for measuring, receiving or detecting environmental, lighting orother sensory input. In one embodiment, a sensor 75 is incorporated intothe fixture 70 and is integral therewith. Embodiments may also includedetachable sensors such as shown as 76 and 77. Sensor 76 affixes to themain fixture 70 via a clip, magnet or other securing means. Sensor 77 istethered to fixture 70 such that it can be positioned at a variabledistance below or away from the main fixture 70. Such tethering allowsfor the sensor to be place in closer proximity to the area ofmeasurement interest (e.g., plant canopy). Each of the example sensors75, 76, and 77 receive power and can transmit sensor data via one ormore conductive cables 78 that connect each sensor to the external powerand communications port 73. In one embodiment the conductive cable 78for sensor 77 also functions as an adjustable tether. The location ofthe sensors as shown is for illustrative purposes only and it is to beunderstood that the sensors may be located in a variety positions on andin relation to the LED grow light fixture. Each sensor may be “plug andplay” in that each sensor may be connected via the appropriate cable andconnectors (e.g., USB or Ethernet) to the power and communications port73 on the main fixture. In these embodiments, the sensors are powered bythe external power port 73 and may transmit sensor data to the fixtureor an external controller for recordation and processing. A programmablecontroller (not shown), integrated into the main fixture or remote fromthe fixture, for instance an external laptop computer, may process thesensor data and adjust one or more devices in the grow facilityoperation in response to specific sensor data thereby providing a sensorfeedback and control system. In one embodiment, the integrated sensor 75is a photometric sensor for measuring light spectrum and intensity. Thespectral data from the integrated sensor 75 may be used to tune theoutput spectrum of one or more LED lighting units. In anotherembodiment, the clip-on sensor 76 is a temperature sensor. Thetemperature data may be used by the controller to adjust ventilation orair conditioning within the grow facility or in proximity to thelighting fixture on which the sensor is attached. In another embodiment,the tethered sensor 77 is a motion sensor for detecting movement in thegrow facility that may result in the triggering alarms or alerts (forinstance, in case of unauthorized intrusion into the grow facility). Thetether that secures the tethered sensor may be the power andcommunications cable itself in some embodiments. In another embodiment,a sensor is a proximity sensor. In this embodiment, the proximity sensormeasures the distance from the fixture to the plant canopy, and thisinformation can be used to adjust the fixture to maintain optimumdistance between the fixture light source and the canopy (e.g.,automatically or manually). The received sensor data at the main fixture70 may be transmitted to other devices directly or via a data network,e.g., PAN, Wi-Fi or Ethernet (not shown). In some embodiments, thisnetwork is also used by the controller to send control signals todevices and actuators within the grow facility. Additional embodimentsinclude the main fixture 70 comprising an integrated or attachablewireless communications capability that is powered by the power port 73or alternatively is powered by the fixture power supply. In someembodiments one or more of a variety of sensors can be added as neededto measure environmental and/or plant growth data, and these data may beused by an external programmable controller to automatically controlother devices or actuators in response to measured environmentalparameters. Alternatively, the sensor data may be relayed to a remotestation for human monitoring.

FIG. 5 shows an end view of an LED grow light fixture 80 with integratedexternal power port 82 and an integrated wireless communication module84 for receiving data from a remote soil sensor 86 via a wirelesstransmission according to one embodiment. In one embodiment, LED growfixture 80 is suspended via hangers or other support means above plantgrowth canopy 88 and comprises an integrated radio module 84, in thisexample a Bluetooth radio module, for receiving remote sensor data 89.In one embodiment, the remote sensor 86 is a soil or grow media sensor,which is in contact with the soil or other grow media, and which sensesand transmits data regarding the soil or grow media. The remote sensormay be powered by internal means such as a battery, capacitor orphotovoltaic cell (e.g., powered by incident light from the lightfixture) or may be provided power by a remote source via wire orwireless transmission. Examples of such sensor data include but are notlimited to, temperature, pH, salinity, moisture and nutrient levels. Insome embodiments, the sensor continually or intermittently transmitssensor data according to a schedule. In other embodiments, the sensor isqueried by the LED fixture via the radio module 84 and the sensor 86transmits data to the fixture in response to the query. The sensor datamay be used by a separate networked controller (not shown) to effectchanges to the soil or grow media including increasing or decreasingtemperature via heaters or chillers, adding nutrients and/or water andadjusting salinity or acidity via a circulation, filtration or feedingsystem. In some embodiments, the sensor data received by the lightfixture's radio module 84 is transmitted via Ethernet or other wirelinecommunications means to a remote controller or monitoring station. Inother embodiments, the sensor data is transmitted wirelessly (e.g., viaBluetooth or Wi-Fi). In some embodiments the controller may resident onthe light fixture. In other embodiments, the sensor data is transmittedvia the lighting fixture to a remote computer such as a laptop ortablet. In some embodiments the radio module 84 of the main fixture 80transmits signaling or actuator commands to remote devices enabled toreceive radio signaling. As shown in FIG. 5 and according to oneexample, radio module 84 transmits a signal to a remote sprinkler ormister 85 to initiate watering of the plants in response to data fromsensor 86 indicating a need for increased moisture.

Although embodiments of the present invention have been described foruse with plants growing in typical controlled environmental settings,such as with soil, soil-less solid media, hydroponics, aeroponics, etc.,the teachings are also suitable to any application wherephotosynthetically active radiation is required and supplied and wheresensor data for control and/or monitoring of the environment isadvantageous. For example, the teachings can be applied forillumination, monitoring, and actuation in marine aquaculture.

In some embodiments grow light fixtures incorporate digital powersolutions and may be powered by digital power, conventional power orboth. Digital power refers to power transmitted digitally. One exampleof digital power solution that may be used in an embodiment is thatprovided by VoltServer, Inc, and is described in the following US patentdocuments that are incorporated herein in their entireties: 20150207318,U.S. Pat. Nos. 8,781,637 and 9,184,795. Digital power provides atouch-safe electrical transmission at high power levels and an inherentability to digitally control a host of modern electronic devicesconnected to the power distribution system. In contrast with analogpower transmission systems, in digital power transmission systemselectrical energy is “packetized” into discrete units, and individualunits of energy can be associated with analog and/or digital informationthat can be used for the purposes of optimizing safety, efficiency,resiliency, control or routing. Advantages of using digital powerinclude reduced installation time and costs and increased efficiency.For example, digital power can be transmitted over Ethernet (or CAT5)type cable. The cable is relatively inexpensive and easy to install anddoes not require meeting certain necessary building safety coderequirements which may add to installation time and cost. In theseembodiments grow light fixtures may be connected to a power sourcethrough Ethernet cable (or other digital cable or wire suitable fordigital power transmission), providing a safe, quick and cost effectivesolution for grow facilities.

In some embodiments, one or more fixtures functions as a hub from whichpower is routed and distributed to other fixtures. In other embodiments,fixtures may be added at will to a grow light facility by simply tyingthe fixture into the digital power network via a network cable asdescribed above. In some embodiments both data and power are transmittedover the same cable. In other embodiments, data may be transmitted overdifferent connections than that of the power including Wi-Fi,blue-tooth, infrared, and other data communication protocols.

Another embodiment of the invention relates to the turn-on timing ofindividual grow lights in a plant growing facility or the turn-on timeof individual power supplies within one grow light fixture. It is knownthat when a modern switching power supply is energized from a cold statethe many reactive components (capacitors and inductors) in the powersupply lead to transient currents and voltages that differ substantiallyfrom steady-state currents and voltages. Supplies will pull asignificantly greater current during startup (referred to as the in-rushcurrent) than they demand once steady-state operation has been achieved.This simultaneous in-rush event is complicated by spaced apart powersupplies, such as in a large plant grow facility, and also by thepresence of transient voltage suppressors, under-voltage shut-offcircuits, and over-current protection devices within each supply.

While power supplies are generally tolerant of a small number poweringup and demanding in-rush currents simultaneously, the transient effectof powering a large number of such supplies simultaneously can lead toinstability in the line voltage that is delivered by each supply to itsload. Due to simultaneous in-rush demands of many supplies, action ofthe protection devices within the supplies, line propagation delays onlong circuits, and inductance of the transformer coils, the output fromthe power supplies can interact to produce unacceptable voltagefluctuations on the circuit, potentially introducing voltagefluctuations that lie outside of the acceptable operating range for anindividual power supply. Although this effect is expected to beshort-lived for any one occurrence, the cumulative damage inflicted onmany supplies over a long time duration (i.e., over many power-cycles)can lead to premature power supply failure.

According to this embodiment of the invention, the grow light fixturefurther comprises a power-on delay switch (alternatively, the delayswitch can be mounted in the power line carrying power to the fixture)that waits a programmable or random period of time before closing andsupplying power to the fixture and the lights mounted within it. Withthe use of the delay switch, when multiple fixtures are disposed on asingle power-carrying circuit, power is supplied to each fixture at aslightly different time. This feature limits the total in-rush currenton the power circuit and thus avoids unnecessary circuit breakertripping.

The switch can be either programmable, such that each supply on a singlecircuit is programmed to turn-on at a slightly different time, or eachswitch may generate the delay time randomly. If generated randomly, therange of potential delay times can be uniformly distributed over aninterval large enough to make it statistically unlikely that more thanone supply powers on simultaneously. Typically, an in-rush current eventmay have a 100 microsecond duration so that several switching powersupplies can be powered up during a one second interval. Staggering thepower supply turn-on times over a few second interval will have nopractical significance to operation of the grow facility.

While the invention has been described with reference to exemplaryembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the invention. Itshould be understood that the diagrams herein illustrates some of thesystem components and connections between them and does not reflectspecific structural relationships between components, and is notintended to illustrate every element of the overall system, but toprovide illustration of some embodiments of the invention to thoseskilled in the art.

In addition, many modifications may be made to adapt a particularsituation or material to the teachings of the invention withoutdeparting from the essential scope thereof. Therefore, it is intendedthat the invention not be limited to the particular embodiment disclosedas the best or only mode contemplated for carrying out this invention,but that the invention will include many variants and embodiments. Also,in the drawings and the description, there have been disclosed exemplaryembodiments of the invention and, although specific terms may have beenemployed, they are unless otherwise stated used in a generic anddescriptive sense only and not for purposes of limitation, the scope ofthe invention therefore not being so limited. Moreover, the use of theterms first, second, etc. do not denote any order or importance, butrather the terms first, second, etc. are used to distinguish one elementfrom another. Furthermore, the use of the terms a, an, etc. do notdenote a limitation of quantity, but rather denote the presence of atleast one of the referenced item.

What is claimed is:
 1. A lighting fixture with an integratedsupplemental power source comprising: an LED light engine comprising atleast one LED; a power supply for powering said LED light engine; anauxiliary power source operative to provide electrical output power fromthe lighting fixture; and an input means for receiving power from anexternal power source to provide power to said power supply and to saidauxiliary power source.
 2. The lighting fixture of claim 1 wherein saidauxiliary power source also provides for the transmission and receptionof data.
 3. The lighting fixture of claim 1 wherein said LED lightengine produces light tailored for agricultural, horticultural or otherplant growth applications.
 4. The lighting fixture of claim 1 whereinsaid auxiliary power source is a USB port integrated into the lightingfixture.
 5. The lighting fixture of claim 1 wherein said auxiliary powersource is a Ethernet Hub integrated into the lighting fixture.
 6. Thelighting fixture of claim 2 further comprising a sensor for sensing atleast one parameter from the environment or the lighting fixture andwherein said sensor is powered by said auxiliary power source.
 7. Thelighting fixture of claim 6 wherein data communications capabilitybetween said sensor and said fixture is provided by said auxiliary powersource.
 8. The lighting fixture of claim 1 further comprising asupplemental lighting module for providing supplemental lighting saidsupplemental lighting module being powered by said auxiliary powersource and not being powered directly by said power supply.
 9. Thelighting fixture of claim 1 further comprising an antenna for wirelesscommunication.
 10. The lighting fixture of claim 9 further comprisingmeans for wireless Bluetooth data reception and transmission.
 11. Thelighting fixture of claim 2 wherein said auxiliary power source sendsdata signals to control and/or power one or more switches or actuators.12. The lighting fixture of claim 11 wherein said switches or actuatorscontrol or actuate at least one of: lighting, ventilation or airtemperature, humidity, soil irrigation, nutrient delivery, lightingfixture orientation or configuration, video cameras, warnings, or datalogging.
 13. An LED grow lighting fixture with an integratedsupplemental power source comprising: an LED light engine operative toproduce light tailored for plant growth; a power supply for poweringsaid LED light engine; an auxiliary power source operative to provideoutput power from the lighting fixture and provide for datacommunications; an input means for receiving power from an externalpower source to provide power to said power supply and to said auxiliarypower source.
 14. The lighting fixture of claim 13 wherein saidauxiliary power source is a USB port or the Ethernet hub integrated intothe lighting fixture.
 15. The lighting fixture of claim 14 wherein saidinput means for receiving power from an external power source isoperative to receive digital power.
 16. The lighting fixture of claim 13further comprising a sensor for sensing at least one parameter from theenvironment or the lighting fixture and wherein said sensor is poweredby said auxiliary power source.
 17. The lighting fixture of claim 13further comprising means for wireless communications.
 18. An LED growlight fixture with integrated supplemental power, wirelesscommunications and sensor capabilities comprising: an LED light engineoperative to produce light tailored for plant growth; a power supply forpowering said LED light engine; a USB port or Ethernet Hub operative toprovide output power from the lighting fixture and provide for datacommunications; a means for wireless communications; and a sensor formeasuring at least one aspect of the environment or lighting fixturewherein the sensor is powered by said USB port or Ethernet hub.
 19. TheLED grow light fixture of claim 18 further comprising a supplementallighting module for providing supplemental lighting, said supplementallighting module being powered by said auxiliary power source and notbeing powered directly by said power supply.
 20. The LED grow lightfixture of claim 18 wherein said means for wireless communicationsinclude a Bluetooth antenna.